Optically-detected spin-echo method for relaxation times measurements in a Rb atomic vapor

Gharavipour, Mohammadreza; Affolderbach, C.; Gruet, Florian; Radojičić, I. S.; Krmpot, Aleksandar J.; Jelenković, Branislav; Mileti, G.

doi:10.1088/1367-2630/aa73c2

Cited by 10 publications

(10 citation statements)

References 51 publications

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“…The contribution from Rb-Rb pairwise collisions has to be completely ruled out because of a small value of the cross-section (1.9×10 −14 cm 2 , [11]) and very low vapor density. As it was shown in [12], the spin-exchange binary collisions in comparable experimental conditions yield only ∼ 2π× 25 Hz contribution. In our experiment, the mean atomic velocity v = 8kBT /πm = 265 m/s (kB is Boltzmann constant, T is cell temperature, m is atomic mass).…”

Section: Discussion and Emerging Resultssupporting

confidence: 64%

“…3/2 [12,16], where µ = 2.405 is the first zero of the Bessel function, D [cm 2 /s] is the diffusion coefficient dependent on pressure and temperature, D0 is the diffusion constant at normal conditions (pressure p0 = 760 Torr, temperature T0 = 273 K), p and T are the pressure and temperature of the cell. Taking the values for present work d = 2 cm, l = 13.5 cm, and γ0 D ≈ γ0 = 2π× 6.25 kHz, we obtain for the diffusion coefficient D ≈ 1070 cm 2 /s.…”

Section: Discussion and Emerging Resultsmentioning

confidence: 99%

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Fluorescence of rubidium vapor in a transient interaction regime

et al. 2019

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We have studied modification of the fluorescence spectra of a room-temperature atomic rubidium vapor in the region of 85 Rb and 87 Rb D2 line while changing the temporal rate of linear (triangular) scanning of laser radiation frequency. Increase of the ramping speed over certain value (≈ 10 6 MHz/s) results in essential modification of magnitudes of individual atomic transitions, different on rising and falling slopes, which characterize transition from a steady-state interaction regime to a transient one. Our experimental results are well consistent with the developed theoretical model. The obtained results can be used for determination of atomic system parameters such as ground-state relaxation rate. Possible follow-up actions on addressed control of atomic levels population is discussed.

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Section: Discussion and Emerging Resultssupporting

confidence: 64%

Section: Discussion and Emerging Resultsmentioning

confidence: 99%

Fluorescence of rubidium vapor in a transient interaction regime

et al. 2019

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“…To characterize the atomic properties of the Rb sample in the clock cell, we measured the longitudinal relaxation time T 1 , directly accessible with an optical detection of the population evolution, with the Franzen method [32,33]. By this means we get T 1 = 1.7(2) ms at 64.…”

Section: Experimental Characterizationmentioning

confidence: 99%

Loaded microwave cavity for compact vapor-cell clocks

Gozzelino¹,

Micalizio²,

Calosso³

et al. 2020

Preprint

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Vapor-cell devices based on microwave interrogation provide a stable frequency reference with a compact and robust setup. Further miniaturization must focus on optimizing the physics package, containing the microwave cavity and atomic reservoir. In this paper we present a compact cavity-cell assembly based on a dielectric-loaded cylindrical resonator. The structure accommodates a clock cell with 0.9 cm 3 inner volume and has an outer volume of only 35 cm 3 . The proposed design aims at strongly reducing the core of the atomic clock, maintaining at the same time high-performing short-term stability (σy(τ ) ≤ 5×10 −13 τ −1/2 standard Allan deviation). The proposed structure is characterized in terms of magnetic field uniformity and atom-field coupling with the aid of finite-elements calculations. The thermal sensitivity is also analyzed and experimentally characterized. We present preliminary spectroscopy results by integrating the compact cavity within a rubidium clock setup based on the pulsed optically pumping technique. The obtained clock signals are compatible with the targeted performances. The loaded-cavity approach is thus a viable design option for miniaturized microwave clocks.

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“…27 The Ramsey technique has also been used to measure ground-state relaxation times in atomic vapors for atomic clock and quantum information processing applications. [28][29][30] Typically, in pulsed CPT, multiple Ramsey fringes are generated as the frequency difference between the laser fields is varied around the two-photon resonance condition. 13,16 The central fringe is used for realizing the Ramsey clock.…”

Section: Introductionmentioning

confidence: 99%

Pulsed coherent population trapping with repeated queries for producing single-peaked high contrast Ramsey interference

Warren

Shahriar

Tripathi

et al. 2018

Journal of Applied Physics

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A repeated query technique has been demonstrated as a new interrogation method in pulsed coherent population trapping for producing single-peaked Ramsey interference with high contrast. This technique enhances the contrast of the central Ramsey fringe by nearly 1.5 times and significantly suppresses the side fringes by using more query pulses (>10) in the pulse cycle. Theoretical models have been developed to simulate Ramsey interference and analyze the characteristics of the Ramsey spectrum produced by the repeated query technique. Experiments have also been carried out employing a repeated query technique in a prototype rubidium clock to study its frequency stability performance.

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Optically-detected spin-echo method for relaxation times measurements in a Rb atomic vapor

Cited by 10 publications

References 51 publications

Fluorescence of rubidium vapor in a transient interaction regime

Fluorescence of rubidium vapor in a transient interaction regime

Loaded microwave cavity for compact vapor-cell clocks

Pulsed coherent population trapping with repeated queries for producing single-peaked high contrast Ramsey interference

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